Not sure if it's my ram or mobo giving me this issue

A week ago I noticed massive fps drops in games. From turning my computer on and going into COD BO2 my frame rates would be between 10-20 FPS, restarted would correct this issue; a similar issue was happening in Marvel Heroes. Computers responsiveness dropped 50%,  Went into task master saw only 4 gigs was being seen went into Windows properties which stated Installed memory 6.00GB available 3.99GB. Restarted computer same thing. Reseated ram things worked fine until yesterday. Was having the above mentioned issue. In Bios defaulted settings. Loaded Windows. Went to play a game COD BO2 BSOD Message flashed to fast to read. Event view is saying this. The computer has rebooted from a bugcheck.  The bugcheck was: 0x00000124 (0x0000000000000000, 0xfffffa8007a2c028, 0x00000000b2000000, 0x000000000004008f). A dump was saved in: C:\Windows\MEMORY.DMP. Report Id: 082513-34663-01. 
Memtested ram with 4.20. First test passed, during testing I noticed ram wasn't at designed specs. Went Into bios and applied the correct settings. Ran three more tests in memtest pass. Went into windows opened up netflix started watching movie BSOD. Went back into bios defaulted memory settings. Computer is working fine. Just not sure what the issue is. I'm thinking the dimms on the board are going. 

Intel Core i7 930 @ 3.8GHz,  EVGA X58 FTW3 MOBO 
Corsair H50, 6 Gig of Dominator DDR3 1600Mhz 8-8-8-24 
1 EVGA GTX 660Ti 2GB FTW Sig 2 
1 LiteOn  SATA DVD Burner 
1 LiteOn  SATA Blu-Ray Drive 
1 WD CB 1TB 7200RPM 64MB  6Gbs HD 
2 Seagate Barracuda 7200.10 500GB HD 16MB, 
2 Seagate Barracuda 7200.10 1TB HD 32MB, 
Corsair AX 1200 PSU Antec 12 
Windows 7 Pro 64 

Don't use Memtest86+ v4.2 it does not test 64-bit CPUs made in the last 6 years and DDR3 RAM correctly. Get Memtest86+ v5.0RC1 and make sure your CPU does not reach above 100*C during the last 4 tests, otherwise your memory controller will throw off false errors. If you have to, reduce your overclock to pass test 7, 8, and 9 out of 10 if you are overclocking. Tests 7, 8, and 9 pull serious stress on the CPU Cache and memory during those tests which will cause your CPU to get very hot. My FX-8350 at 4.8GHz will top out at 82*C during those tests, if I go past 85*C I get false errors as the CPU and memory controller stop responding.